B-Line Eaton series imperial cable tray and ladder - Length 34.953 in, Width 36 in, Height 6 in - Aluminum

It's a 45 degree vertical inside bend for Eaton B-Line series imperial ladder tray, sized for 36 inch wide tray with a 6 inch side rail height. A vertical inside bend turns the run up or down where the cables stay on the inside of the turn, so use it where the tray changes elevation and the bend curves toward the cable side. For a turn the other direction you need the vertical outside version instead.

Aluminum. That keeps the weight down at 15.9 lb for a 36 inch wide fitting, which matters when one electrician is holding it in place overhead, and it handles damp and corrosive environments better than plain painted steel. Keep the fitting material the same as the tray run so you aren't mixing aluminum and steel at bolted joints.

The 6A-36-45VI36 vertical inside bend carries CSA certification, which is what an inspector on a Canadian project will look for and is commonly accepted on spec work in the US as well.

Yes, and they are ordered separately. The 6A-36-45VI36 is the bend section only; you'll need the matching B-Line splice plates and bolt hardware at each end to tie it into the straight tray, plus supports on both sides of the turn. Match the splice hardware to Series 2-5 imperial ladder tray so the rail bolt pattern lines up.

15.9 lb for the fitting itself. Add that to your cable fill when you size the trapeze or drop rods at the elevation change, since a bend usually needs support on both sides of the turn rather than relying on the straight sections to carry it.